Oh My Girl (Korean: 오마이걸, also stylized as OH MY GIRL and OMG) is a South Korean girl group formed by WM Entertainment. The group is composed of seven members: Hyojung, Mimi, YooA, Seunghee, Jiho, Binnie and Arin. Originally an eight-piece group, JinE left the group in October 2017 due to health issues. Oh My Girl debuted on April 21, 2015, with an eponymous mini-album.[2][3]

Oh My Girl was publicized as the sister group of label-mate group B1A4. On March 29, 2015, teaser images of the eight members were released as well as their concept images.[4] On April 20, the group released their first mini album, Oh My Girl, which included the single "Cupid". They held their debut showcase the same day.[5] They first performed the single on SBS MTV's The Show on April 21.[6]

On June 21, the group announced that they were currently preparing a new album.[7] Their second mini album, Closer, was released on October 7.[8] The single of the same name was promoted on music shows.

On December 11, Oh My Girl flew to Los Angeles for a photoshoot for their next album jacket and to perform at a special event, but could not get cleared by customs to enter the U.S. The group's management claimed that customs mistook the girls for underage prostitutes due to props and outfits for their special performance at an event on the Saturday of that week, and that they were detained for 15 hours.[9] However, an official with the U.S. Customs and Border Protection later stated that management was lying about the reason for being denied entry. Upon seeing the contents of the performers' luggage, customs officials determined the group was entering the U.S. to perform, not to go sightseeing as the group had claimed. As the group did not have the required P1 performance visa, they were denied entry. The customs official denied that the group was "detained" for 15 hours, noting that they were put on the first available flight back to Korea on the airline they traveled with.[10]

Oh My Girl's third EP, Pink Ocean, was released on March 28, 2016 with the title track "Liar Liar", and a pre-released single "Step by Step".[11][12] On the same day, Oh My Girl announced their official fandom name, "Miracle", at their comeback showcase for Pink Ocean and also on the group's V-app. The group promoted "Liar Liar" and "Step by Step", a B-side written by B1A4's Jinyoung,[12] on their comeback stages and at guerrilla concerts in Hongdae and Sinchon. In the beginning of May, the group promoted "Step by Step" for four days on the music programs M! Countdown, Inkigayo, Music Core and Music Bank.

On May 26, 2016, Pink Ocean was reissued as Windy Day with two new songs: "Windy Day" and "Stupid in Love", along with the Chinese version of "Liar Liar" (which was released in Pink Ocean exclusively on online streaming services in China).[13] On August 1, they released a special summer single album containing four remake songs, including Papaya's "Listen to My Word (A-ing)" featuring Skull and Haha.[14] The album was the group's first to top the weekly charts.[15]

On August 20 and 21, Oh My Girl held their first solo concert titled Summer Fairytale at the Blue Square Samsung Card Hall in Seoul, South Korea.[16] Tickets were available to purchase on July 22 and were sold out within three minutes, breaking the record for the fastest sold-out concert for a rookie group.[17]

On August 25, WM Entertainment released a statement announcing JinE's hiatus from Oh My Girl's activities while she received treatment for anorexia nervosa.[18]

On March 13, WM Entertainment announced on Oh My Girl's fancafe that their next album is scheduled to be released in April. JinE will not be taking part in upcoming album promotions and activities in favor of continued treatment and recovery.[19] WM has also stated that JinE's health has improved since last year, and WM is focusing on long-term treatment for JinE.[20] Oh My Girl's fourth EP, Coloring Book, was released on April 3, along with the title track of the same name. During Oh My Girl's Comeback Showcase, it was revealed that the pink whale in the Coloring Book MV, was made in reference to JinE.[21]

On October 30, WM Entertainment confirmed that due to continued health issues, JinE's contract with the company had been terminated and that she had officially left the group.[22]

On December 23, 2017, WM Entertainment announced Oh My Girl's comeback on January 9, with their fifth EP Secret Garden.[23] Oh My Girl held their second solo concert titled Oh My Girl's Secret Garden. Tickets were available to purchase on December 28 and were sold out within two minutes for 3,000 tickets, proved their popularity by completely selling out concert since last year.[24][16] The six-day sold-out concert held beginning January 22 to 26 February at the Shinsegae Mesa Hall in Seoul, South Korea.[25] On January 23, 2018 Oh My Girl won their first music show trophy on The Show and the second trophy on Show Champion on January 24, 2018, with "Secret Garden".[26][27]

It was announced that the group would release a pop-up album titled Oh My Girl Banhana - Banana Allergy Monkey on April 2. The title track "Banana Allergy Monkey" is sung by the group's sub-unit Oh My Girl Banhana, which consists of Hyojung, Binnie and Arin.[28]

In June, the group signed a recording deal with Sony Music Japan. The Banhana sub-unit will debut first before the group as a whole in August 2018.[29]

On August 24, WM Entertainment confirmed that the group will make a Korean comeback on September 10, with their 6th mini album Remember Me. The group's 2nd concert titled Autumn Fairytale is also announced to happen on October 20–21.[30]